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Adding a filter

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Thinking of adding a 2nd filter to our 20 gallon tank before we add any more fish. I have been using aqadvisor.com to help with figuring out what my tank can hold and such and it is recommending more filtration before adding any more fish. We currently have a marineland penguin 150. I was thinking of adding an additional penguin 100 which would for sure cover what I need but is there something else I should think hard about going for? Or staying away from? I was wanting to to go the 2 filter route since my tank is cycled and I don't want to lose what is on the bio wheel in my current filter.

I'm a big fan of using multiple filters on a tank. I would suggest adding a second one, but I would recommend a AC50 or AC30 instead. You can add a second filter without having to worry about it negatively effecting the exsisting filter.

If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease."Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony CalfoFishless CycleCycling with FishMarine Aquarium Info [URL="http://saltwater.aquaticcommunity.com/"]

If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease."Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony CalfoFishless CycleCycling with FishMarine Aquarium Info [URL="http://saltwater.aquaticcommunity.com/"]

I'm a big fan of using multiple filters on a tank. I would suggest adding a second one, but I would recommend a AC50 or AC30 instead. You can add a second filter without having to worry about it negatively effecting the exsisting filter.

Cliff, at what volume does one switch from one or two HOB's to a Canister Filter or one of each?